Friction-latch.



G. N. MASON.

rmcnow LAT CH. APPLICATION FILED MMLZS. I916.

Patented June 27, 1916.

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eEoEeE N. MASoN, 0F MOUNT PENN, PENNSYLVA IA, ASSIGNOR r0 READING HARD- WARE COMPANY, OF READING, PENNSYLVANIA, A coEPoEA'rIoN 0E PENNSYL- VANIA.

EBIc'rIoN-LATcH.

Application filed March 23, 1916. Serial No. 86,067. i

To all whom it may concern: 7

Be it known that I, GEORGE N. MASON, a citizen of the United States, residing at Mount Penn, in the county of Berks and State of Pennsylvania, have invented certain new and useful Improvements in Friction-Latches, of which the following is a specification.

I This invention relates to improvements in friction latches and it is intended more particularly for use on adoor in which it is desired to lock the door against opening through the use ,of the outside knob, while the inside knob action will be free to open the door.

The invention includes means for thus locking the outside knob action through the medium of key operated mechanism operable from either side of the door.

An essential feature of the invention is a means for dogging the latch bolt to prevent retracting the said latch bolt by means of a knife blade or like device inserted through the crevice between the lock and the strike plate; and in means for releasingthe dogging device through the medium of the latch bolt retracting lever.

A further object is to provide a two-part knob hub, one of which parts is actuated by the outside knob, and a slide adapted to be thrown into engagement with said hub member through the medium of a lever actuated by a key and its co-acting parts.

A further object is to provide means for disengaging the dogging device from the latch bolt and to hold it in disengaged position while the door is open.

The invention is more fully described in the followingspecification and clearly illustrated in the accompanying drawing in which Figure 1 is a plan view of the latch, showing the locking slide out of engagement with the hub, both hub members being free to be operated by their respective knobs and with the dog in normal engagement with the latch bolt. Fig. 2 is a like view with the outside knob locked against latch retracting action, Fig. 3 is a detail view showing the latch bolt and the dogging device in release position. Fig. 4 is a detail view of the dog operating lever.

The numeral 1 designates the casing; 2

the spring backed latch bolt; 3 the latch retracting lever, and 4-5 the two-part hub. The hub member 4 being adapted for re tracting the latch bolt from the outside of the door and the member 5 for retractingit from the inside, both of which are capable of moving the retracting lever whose lower extremity engaged the rear end of the latch bolt.

The numeral 6 designates a locking slide, provided with suitable guides 7 and 8 and lying in alinement with a recess 9 in the hub member 4.

The numeral 10 designates a pivotally mounted lever, one end of which is bifurcated at 11 for engagement with a pin 12 on the slide 6 while its opposite end engages a lug on the slide plate 13. This plate is slidably mounted on a pin 14 on the catsing and is provided with one or more tumblers 15 adapted to be operated by an ordinary door key, whereby, when the tumblers are raised the slide plate will be free to be moved in either direction.

The numeral 18 designates a friction latch provided with a spring 19 adapted to hold it normally projectedand a lug 20 is formed on the inner end of this latch.

The numeral 21 designates a dog, pivotally mounted on a pin 22 in the casing and provided with a spring 23 to keep its free end 24 normally in engagement with the shank 25 of the latch bolt 2. This dog is formed with a depending lip 26 adapted to contact with the lug 20 on the friction latch when said friction latch is projected. On the pin 22 is also mounted a dog operating lever 30, substantially S-shaped, formed with a lip 31 which lies between two lugs 32-33 on the surface of the dog 21. The elongated end 34 of this lever 30 is curved and its extremity is formed with a depression 35 adapted for engagement by a lug 36 on the free end of the latch retracting lever 3.

With the parts in the position shown in Fig; 1, the latch bolt may be retracted and the door opened by turning the knob on either side of the door. When it is desired to lock the latch bolt against retraction by the outside knob action, the key is inserted and the slide plate thrown to the front of the casing, that is, to the position shown in 1. In a latch, a casing,

Fig. 2. This action will, through the medium of the pivoted lever 10, throw the end of the locking slide 6 into the recess 9 of the hub member 4 and lock that member against turning, which will efi'ectually prevent opening the door from the outside by the knob action, while the inside knob action will be free to retract the latch bolt, as shown in Figs. 2 and 3.

It is evident that the locking slide may beothrown into or out of engagement with the hub member 4 by the key actuated mechanism from either side of the door.

When the outside knob act-ion is not locked, the turning of either knob will move the lever 3 and the lug 36 will depress the elongated end of the lever 30 and cause the lip 31 on its opposite end to bear against the lug 32 and thus raise the free end 2 L of the dog free from engagement with the latch bolt 2, and the continued movement of the lever 3 will retract the latch bolt.

When the outside knob action is locked,

through the key operated mechanism above described, the outside knob cannot turn but the inside knob will be free to turn the hub member 5 and this will actuate the lever 3, releasing the dog through the lever 30, and permit the latch bolt to be retracted.

Figs. 1 and 2 show the parts 1n position with the door closed, and the numera l 40 designates the strike plate. In this posit on the friction latch 18 contacts with the strlke plate and its lug 20 is kept free from contact with the lip 26 on the dog, but, when the door is open the spring 19 will pro ect the latch 18 and the lug 20 will press forward on the lip 26 and raise the free end 24 of the dog from its engagement with the latch 2, so that it will be free to move when the door is in the act of closing, and this closing of the door will force the latch 18 to its innermost position, as shown, and allow the end 24 of the dog to again engage the latch bolt. The latch shown is reversible, in that it may be applied to doors operating in both directions by merely reversing the latch bolt so that it will contact with its tapered surface on the lock strike, and to facilitate this easy reversal, the projecting end of the friction latch may be rounded if desired.

Having thus fully described my invention, I claim a spring backed latch bolt, a retracting lever for the latch bolt, a lug on the free end of said lever, a two-part hub adapted to actuate said lever, one hub member being operable from the outside and the other from the inside of the door, a horizontally movable locking slide adaptedto be moved into engagement with the outside operating hub member, a pin on said slide, a lever pivoted to the casing and having a bifurcated end engaging the pin, a

slide plate in engagement with the opposite end of said lever .and key actuated means for moving said slide'plate, whereby the turning of the key from either side of the door will lock the latch bolt against retraction from the outside, a dog pivotally mounted in the casing whose free end normally engages the latch belt, a lug on the dog, a lever mounted on the same pivot with the dog, a lip on said lever for engagement with the lug on the dog, the opposite end of the lever having a depression for engagement with the lug on and the otherend the key operated mechanism, in combination with a dog pivotally mounted in the casing and whose free end normally engages the latch bolt, a lug on said dog, an operating lever for the dog, a I

lip on said operating lever adapted to engage the lug on the dog, the opposite end of said lever being in engagement with the latch bolt retracting lever, whereby the actuation of the retracting lever the dog from the latch bolt.

3. In a latch the combination of a latch bolt, a retracting lever therefor, a two-part hub, one of which is operable from the outside and the other fromthe inside, a locking slide for the outside hub member, key actuated mechanism for operating the slide, a pivoted dog adapted to normallyhold the latch bolt projected, an S-shaped lever pivotally mounted in the casing, one end of which is engaged by the retracting lever and the other end with the dog,'whereby, when the outside hub member is locked the inside hub member may actuate the retracting lever and through the medium of the S-shaped lever release the latch bolt from the dog, and a spring backed friction latch adapted to hold the dog free from engagement with the latch bolt when the door is open.

at. In -a latch bolt dogging mechanism a pivotally mounted dog, a spring to hold the dog normally in engagement with the latch bolt said dog having a lug thereon,'an S- shaped dog operating lever mounted on the pivot with the dog, said lever having a lip at one end for engagement with the lug on the dog and an elongated opposite end formed with a depression,a latch retracting lever formed with a lug adapted to engage the depression in the lever, and a friction latch adaptedto hold the dog free from con will disengage 5. A dogging device for a latch bolt propression adapted for engagement by the vided With a retracting lever, comprising a latch retracting lever, and a friction latch dog, means for holding the dog normally in adapted to hold the dog free from contact 10 engagement with the latch bolt, a pivotally With the latch bolt when the friction latch mounted dog operating lever, a lip on said is in projectedposition. lever adapted for engagement by the dog, In testimony whereof I aflix my signature. the opposite end of the lever having a de- GEORGE N. MASON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

